//
//  ComposeViewController.swift
//  新浪微博
//
//  Created by 焦林生 on 15/11/15.
//  Copyright © 2015年 焦林生. All rights reserved.
//

import UIKit
import SVProgressHUD

//MARK: 撰写控制器
class ComposeViewController: UIViewController {

    //MARK: - 照片选择控制器
    private lazy var pictureSelectorController =  PictureSelectorController()
    
    //MARK: - 表情键盘
    private lazy var emoticonView: EmoticonView = EmoticonView{
    
        [weak self] (emoticon) -> () in
        self?.textView.insertEmoticon(emoticon)
        
    }
    
    //MARK: 选择照片
    @objc private func selectPhoto() {
    
       //退掉键盘
        textView.resignFirstResponder()
        
        //0 判断如果应经更行约束  不再执行后续代码
        if pictureSelectorController.view.frame.height > 0 {
        
            return
        }
        //1 修改照片选择器视图约束
        pictureSelectorController.view.snp_updateConstraints { (make) -> Void in
            make.height.equalTo(view.bounds.height * 0.6)
        }
        
        //2 修改文本视图的约束
        textView.snp_remakeConstraints { (make) -> Void in
            make.top.equalTo(self.snp_topLayoutGuideBottom)
            make.left.equalTo(view.snp_left)
            make.right.equalTo(view.snp_right)
            make.bottom.equalTo(pictureSelectorController.view.snp_top)
        }
        
        //3 动画更新约束
        UIView.animateWithDuration(0.5) { () -> Void in
            //强制更新约束  立即更新
            self.view.layoutIfNeeded()
        }
        
    }
    
    //MARK: 监听方法
    //关闭
    @objc private func close() {
        //关闭键盘
        textView.resignFirstResponder()
    
        dismissViewControllerAnimated(true, completion: nil)
    }
    
    //发布微博
    @objc private func sentStatus() {
        
    
        //1 获取文本内容
        let text = textView.emoticonText
        
        //2 发布微博
        let image = pictureSelectorController.pictures.last
        NetworkTools.sharedTools.sendStatus(text, image: image) { (result, error) -> () in
            if error != nil {
            
                print("出错了")
                SVProgressHUD.showInfoWithStatus("您的微博不给力")
                return
            }
            
            SVProgressHUD.showInfoWithStatus("发布成功")
            
            //关闭控制器
            self.close()
        }
        
    }
    
    //选择表情
    @objc private func selectEmoticon() {
    
        print("选择表情")
        //1 退掉键盘
        textView.resignFirstResponder()
        
        //2 设置键盘
        textView.inputView = textView.inputView == nil ? emoticonView : nil
        
        //3 重新激活键盘
        textView.becomeFirstResponder()
        
    }
    
    //MARK: 键盘处理
    @objc private func keyboardChange(n: NSNotification) {
       
    
        //1 获取目标 rect 字典中的结构体 是nsvalue
        let rect = (n.userInfo![UIKeyboardFrameEndUserInfoKey] as! NSValue).CGRectValue()
        //获取目标的动画时常 字典中的数值是NSNumber
        let duration = (n.userInfo! [UIKeyboardAnimationDurationUserInfoKey] as! NSNumber).doubleValue
        //动画曲线数值
        let curve = (n.userInfo![UIKeyboardAnimationCurveUserInfoKey] as! NSNumber).integerValue
        
        let offset = -UIScreen.mainScreen().bounds.height + rect.origin.y
        
        //2 更新约束
        toolbar.snp_updateConstraints { (make) -> Void in
            make.bottom.equalTo(view.snp_bottom).offset(offset)
        }
        
        //3 动画 
        UIView.animateWithDuration(duration) { () -> Void in
            
        // 设置动画曲线
        /**
        曲线值 = 7
        － 如果之前的动画没有完成，又启动了其他的动画，让动画的图层直接运动到后续动画的目标位置
        － 一旦设置了 `7`，动画时长无效，动画时长统一变成 0.5s*/
            UIView.setAnimationCurve(UIViewAnimationCurve(rawValue: curve)!)
            self.view.layoutIfNeeded()
            
        }
        //调试动画时长 keyPath 将动画添加到图层
        let anim = toolbar.layer.animationForKey("position")
        print("动画时长 \(anim?.duration)")

    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 添加键盘通知
        NSNotificationCenter.defaultCenter().addObserver(self,
            selector: "keyboardChange:",
            name: UIKeyboardWillChangeFrameNotification,
            object: nil)
    }
    
    deinit {
        // 注销通知
        NSNotificationCenter.defaultCenter().removeObserver(self)
    }

    //MARK: - 视图生命周期(视图第一次加载时就会调用)
    override func loadView() {
        view = UIView()
        
        setupUI()
    }
    
    override func viewDidAppear(animated: Bool) {
        super.viewDidAppear(animated)
        
        //激活键盘 如果应经存在照片控制器视图 不再激活键盘
        if pictureSelectorController.view.frame.height == 0{
        
            textView.becomeFirstResponder() 
        }
       
    }
    
    //MARK: 懒加载控件
    //工具条
    private lazy var toolbar = UIToolbar()
    
    //文本视图
    private lazy var textView: UITextView = {
        
        let tv = UITextView()
        
        tv.font = UIFont.systemFontOfSize(18)
        tv.textColor = UIColor.lightGrayColor()
        
        //始终允许垂直滚动
        tv.alwaysBounceVertical = true
        //拖拽关闭键盘
        tv.keyboardDismissMode = UIScrollViewKeyboardDismissMode.OnDrag
        
        //设置文本视图的代理
        tv.delegate = self
        
        return tv
    }()
    
    //占位标签
    private lazy var placeHolderLabel:UILabel = UILabel(title: "分享新鲜事...",
        fontSize: 18,
        color: UIColor.lightGrayColor())

   
}

// MARK: - UITextViewDelegate
extension ComposeViewController: UITextViewDelegate {

    func textViewDidChange(textView: UITextView) {
        navigationItem.rightBarButtonItem?.enabled = textView.hasText()
        placeHolderLabel.hidden = textView.hasText()
    }
}
// MARK: - 设置界面
private extension ComposeViewController {

    func setupUI() {
        //0 取消自动调整滚动视图间距
        automaticallyAdjustsScrollViewInsets = false
    
        //1 设置颜色
        view.backgroundColor = UIColor.whiteColor()
        
        //2 设置控件
        prepareNavigationBar()
        
        prepareToolbar()
        
        prepareTextView()
        
        preparePictureView()
        
    }
    //准备照片视图
    private func preparePictureView() {
    
        //0 添加子控制器
        addChildViewController(pictureSelectorController)
        
        //1 添加视图
        view.insertSubview(pictureSelectorController.view, belowSubview: toolbar)
        
        //2 自动布局
        pictureSelectorController.view.snp_makeConstraints { (make) -> Void in
            make.bottom.equalTo(view.snp_bottom)
            make.left.equalTo(view.snp_left)
            make.right.equalTo(view.snp_right)
            make.height.equalTo(0)
        }
    }
    
    //准备文本视图
    private func prepareTextView() {
    
        //1 添加控件
        view.addSubview(textView)
        
        //2 自动布局
        textView.snp_makeConstraints { (make) -> Void in
            make.left.equalTo(view.snp_left)
            make.right.equalTo(view.snp_right)
            make.top.equalTo(self.snp_topLayoutGuideBottom)
            make.bottom.equalTo(toolbar.snp_top)
        }
        //
        textView.addSubview(placeHolderLabel)
        
        placeHolderLabel.snp_makeConstraints { (make) -> Void in
            make.top.equalTo(textView.snp_top).offset(8)
            make.left.equalTo(textView.snp_left).offset(5)
        }
        
    }
    
    //准备工具条
    private func prepareToolbar() {
    
        //1 添加控件
        view.addSubview(toolbar)
        //设置背景颜色
        toolbar.backgroundColor = UIColor(white: 0.8, alpha: 1.0)
        
        //2 自动布局
        toolbar.snp_makeConstraints { (make) -> Void in
            make.bottom.equalTo(view.snp_bottom)
            make.left.equalTo(view.snp_left)
            make.right.equalTo(view.snp_right)
            make.height.equalTo(44)
        }
        //3 添加按钮
        let itemSetting = [["imageName": "compose_toolbar_picture", "actionName": "selectPhoto"],
            ["imageName": "compose_mentionbutton_background"],
            ["imageName": "compose_trendbutton_background"],
            ["imageName": "compose_emoticonbutton_background", "actionName": "selectEmoticon"],
            ["imageName": "compose_addbutton_background"]]
        
        //实例化一个可变的item数组
        var items = [UIBarButtonItem]()
        
        for dict in itemSetting {
        
            items.append(UIBarButtonItem(imageName: dict["imageName"]!,
                target: self,
                actionName: dict["actionName"]))
            
            //添加弹簧
               items.append(UIBarButtonItem(barButtonSystemItem: .FlexibleSpace, target: nil, action: nil))
            
            
        }
        items.removeLast()
        
        //一旦赋值 就相当于做了一次copy
        toolbar.items = items
        
        
    }
    //设置导航栏
    private func prepareNavigationBar() {
    
        //1 左右按钮
        navigationItem.leftBarButtonItem = UIBarButtonItem(title: "取消", style: .Plain, target: self, action: "close")
        navigationItem.rightBarButtonItem = UIBarButtonItem(title: "发布", style: .Plain, target: self, action: "sentStatus")
        
        //禁用发布微博按钮
        navigationItem.rightBarButtonItem?.enabled = false
        
        //2 标题视图
        let titleView  = UIView(frame: CGRect(x: 0, y: 0, width: 200, height: 36))
        navigationItem.titleView = titleView
        
        //3 添加子控件
        let titleLabel = UILabel(title: "发微博", fontSize: 15)
        let nameLabel = UILabel(title: UserAccountViewModel.sharedUserAccount.userAccount?.screen_name ?? "",
            fontSize: 12,
            color: UIColor.lightGrayColor())
        //
        titleView.addSubview(titleLabel)
        titleView.addSubview(nameLabel)
        
        titleLabel.snp_makeConstraints { (make) -> Void in
            make.centerX.equalTo(titleView.snp_centerX)
            make.top.equalTo(titleView.snp_top)
        }
        nameLabel.snp_makeConstraints { (make) -> Void in
            make.centerX.equalTo(titleView.snp_centerX)
            make.bottom.equalTo(titleView.snp_bottom)
        }
        
        
    }
}





